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Full text of "The Flow Of Gases In Furnaces"

278

APPENDIX VII

The frictional resistances met with in the cinder pockets will
be assumed as equal to those computed for the neck.

The uptakes will be proportioned as follows, and their frictional
resistances computed:


	Gas on Gas
	Air on Air
	Gas on Waste Gas
	Air on Waste Gas

Qt  volume of gases flowing . . Vi ~~ velocities assumed ......
	28 m3 75 15 m/sec
	45 m3 99 10 m/sec
	35 m3 66
	52 m3 08

co = area of uptake, total ....
	2m2 00
	4m2 60
	
	

N ~~ number of uptakes
	1
	2
	
	

2^  velocity, actual          ....
	14m    4
	10m  00
	17 m  83
	11 m 32

$ = perimeter (assumed) ....
	5 m  00
	12 m    0
	
	

L ~~ height =
	3 m  00
	
	
	

$ __ w                                         ....
	7 50
	7.83
	
	

7  frictional resistance in kg per m2 = 0 016X7 50X14 40X0 208 =
	0 kg 360
	
	
	

0 016X7 83X10 00X0 239 =
	
	0 kg 300
	
	

0 016X7 50X17 83X0 192 =
	
	
	0 kg 411
	

0 016X7 83X11 32X0 192 =
	
	
	
	0 kg 274

The pressure necessary to impress their velocity upon the flow-ing gases will be*        .......
	
	
	
	

 A<(i)2  '2(]}  Irgr T\QT rn~
	2 kg 199
	1 kg 219
	3 kg 111
	1 kg 254


	
	
	
	

The assumption is made that the turn into the uptakes for the
incoming gas and air absorbs the velocity in the necks and cinder
pockets.


	Gas on Gas
	Air on Air
	Gas on Waste
 Gas
	Air on Waste
 Gas

Frictional resistance of f antails for
	
	
	
	

air and gas :
	
	
	
	

$= perimeter (assumed) ....
	6 m 00
	10 m  00
	
	

L =length ................
	5 m 00
	6 m  00
	
	

C4 = area         ...........
	3 m2 00
	5 m225
	
	

t = average temperature. . . .
	500
	150
	800
	600

i _r_ ,y __ ffo s factor ..............
	2.835
	1 . 5505
	3.936
	3.202